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Progress towards YBa2Cu3O7-δ nanocomposite thin films using chemical solution deposition and preformed nanocrystals

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Abstract
The implementation of YBa2Cu3O7-δ (YBCO) coated conductors in power applications generally has a potential to change the paradigm in large-scale energy applications. Unfortunately, YBCO thin films typically exhibit a strong reduction of the critical current density (Jc) with increasing magnetic field strength caused by vortex motion. In search for a commercially viable way for the production of long length tapes, we opt for chemical solution deposition (CSD). Hereby, the incorporation of preformed nanocrystals (PNCs) as artificial pinning centers was introduced as an adequate approach to achieve flux pinning, preventing the drastic decrease of the critical current density Jc at moderate-to-high magnetic fields as well as its angular dependency on the magnetic field. To achieve this, we have produced nanocomposite thin films starting from PNCs. The use of PNCs generally offers a better control of the final microstructural properties of the nanocomposite films when compared to self-assembled nanoparticles formation during YBCO processing. In this work, small crystalline single (ZrO2 and HfO2) and double (SrTiO3 and BaZrO3) metal oxide nanocrystals were synthesized with diameters in the range of 4-10 nm and capped with hydrophobic ligands to ensure colloidal stability in apolar solvents. However, as the YBCO precursor typically provides a more polar environment, e.g., methanol, an important aspect of this research involves ligand exchange and the appropriate stabilization procedure. We are able to stabilize these nanocrystals in different types of TFA and low-fluorine-based YBCO precursor solutions, leading to highly stable nanocomposite precursors with long shelf-lives. Afterwards, the YBCO-PNC solutions were deposited on single crystal LaAlO3 (LAO) substrates via spin-coating. The main focus of this research pointed to understanding the factors which control the microstructure development and the physical properties of the nanocomposite thin films. By strict optimization on both the precursor and processing level, we achieved nanocomposite thin films exhibiting Jc of 4-5 MA/cm² at 77 K in self-field as well as a much smoother decay of Jc as a function of magnetic field. This is reflected by a strong pinning force enhancement (up to 10 GN/m3 at 77 K) and a reduced effective anisotropy (γeff ~ 3) compared to undoped YBCO films. Hereby, we are also able to transfer these results from LAO substrates to industrial metallic Ni-W substrates. This newly developed approach delivers scalable and high quality superconducting films, capable of meeting the strict requirements for the successful implementation and distribution of coated conductors throughout the energy market.

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MLA
De Keukeleere, Katrien, et al. “Progress towards YBa2Cu3O7-δ Nanocomposite Thin Films Using Chemical Solution Deposition and Preformed Nanocrystals.” Applied Superconductivity, 13th European Conference, Abstracts, 2017.
APA
De Keukeleere, K., Rijckaert, H., Hänisch, J., Cayado, P., Meledin, A., Sieger, M., … Van Driessche, I. (2017). Progress towards YBa2Cu3O7-δ nanocomposite thin films using chemical solution deposition and preformed nanocrystals. In Applied Superconductivity, 13th European conference, Abstracts. Geneva, Switzerland.
Chicago author-date
De Keukeleere, Katrien, Hannes Rijckaert, Jens Hänisch, Pablo Cayado, Alexander Meledin, Max Sieger, Ferran Valles, et al. 2017. “Progress towards YBa2Cu3O7-δ Nanocomposite Thin Films Using Chemical Solution Deposition and Preformed Nanocrystals.” In Applied Superconductivity, 13th European Conference, Abstracts.
Chicago author-date (all authors)
De Keukeleere, Katrien, Hannes Rijckaert, Jens Hänisch, Pablo Cayado, Alexander Meledin, Max Sieger, Ferran Valles, Mariona Coll, Anna Palau, Javier Diez Sierra, Pedro Lopez Dominguez, Ruben Hühne, Jonathan De Roo, Petriina Paturi, Hannu Huhtinen, Gustaaf Van Tendeloo, Teresa Puig, Xavier Obradors, Maximilian Hemgesberg, Michael Bäcker, and Isabel Van Driessche. 2017. “Progress towards YBa2Cu3O7-δ Nanocomposite Thin Films Using Chemical Solution Deposition and Preformed Nanocrystals.” In Applied Superconductivity, 13th European Conference, Abstracts.
Vancouver
1.
De Keukeleere K, Rijckaert H, Hänisch J, Cayado P, Meledin A, Sieger M, et al. Progress towards YBa2Cu3O7-δ nanocomposite thin films using chemical solution deposition and preformed nanocrystals. In: Applied Superconductivity, 13th European conference, Abstracts. 2017.
IEEE
[1]
K. De Keukeleere et al., “Progress towards YBa2Cu3O7-δ nanocomposite thin films using chemical solution deposition and preformed nanocrystals,” in Applied Superconductivity, 13th European conference, Abstracts, Geneva, Switzerland, 2017.
@inproceedings{8531590,
  abstract     = {The implementation of YBa2Cu3O7-δ (YBCO) coated conductors in power applications generally has a potential to change the paradigm in large-scale energy applications. Unfortunately, YBCO thin films typically exhibit a strong reduction of the critical current density (Jc) with increasing magnetic field strength caused by vortex motion. In search for a commercially viable way for the production of long length tapes, we opt for chemical solution deposition (CSD).
Hereby, the incorporation of preformed nanocrystals (PNCs) as artificial pinning centers was introduced as an adequate approach to achieve flux pinning, preventing the drastic decrease of the critical current density Jc at moderate-to-high magnetic fields as well as its angular dependency on the magnetic field. To achieve this, we have produced nanocomposite thin films starting from PNCs. The use of PNCs generally offers a better control of the final microstructural properties of the nanocomposite films when compared to self-assembled nanoparticles formation during YBCO processing.
In this work, small crystalline single (ZrO2 and HfO2) and double (SrTiO3 and BaZrO3) metal oxide nanocrystals were synthesized with diameters in the range of 4-10 nm and capped with hydrophobic ligands to ensure colloidal stability in apolar solvents. However, as the YBCO precursor typically provides a more polar environment, e.g., methanol, an important aspect of this research involves ligand exchange and the appropriate stabilization procedure.  We are able to stabilize these nanocrystals in different types of TFA and low-fluorine-based YBCO precursor solutions, leading to highly stable nanocomposite precursors with long shelf-lives.
Afterwards, the YBCO-PNC solutions were deposited on single crystal LaAlO3 (LAO) substrates via spin-coating. The main focus of this research pointed to understanding the factors which control the microstructure development and the physical properties of the nanocomposite thin films. By strict optimization on both the precursor and processing level, we achieved nanocomposite thin films exhibiting Jc of 4-5 MA/cm² at 77 K in self-field as well as a much smoother decay of Jc as a function of magnetic field. This is reflected by a strong pinning force enhancement (up to 10 GN/m3 at 77 K) and a reduced effective anisotropy (γeff ~ 3) compared to undoped YBCO films. Hereby, we are also able to transfer these results from LAO substrates to industrial metallic Ni-W substrates.
This newly developed approach delivers scalable and high quality superconducting films, capable of meeting the strict requirements for the successful implementation and distribution of coated conductors throughout the energy market.},
  author       = {De Keukeleere, Katrien and Rijckaert, Hannes and Hänisch, Jens and Cayado, Pablo and Meledin, Alexander and Sieger, Max and Valles, Ferran and Coll, Mariona and Palau, Anna and Diez Sierra, Javier and Lopez Dominguez, Pedro and Hühne, Ruben and De Roo, Jonathan and Paturi, Petriina and Huhtinen, Hannu and Van Tendeloo, Gustaaf and Puig, Teresa and Obradors, Xavier and Hemgesberg, Maximilian and Bäcker, Michael and Van Driessche, Isabel},
  booktitle    = {Applied Superconductivity, 13th European conference, Abstracts},
  language     = {eng},
  location     = {Geneva, Switzerland},
  title        = {Progress towards YBa2Cu3O7-δ nanocomposite thin films using chemical solution deposition and preformed nanocrystals},
  year         = {2017},
}